I would definitely get it looked at and repaired by an electrician. There are instances where a warm switch can be a very bad sign. No matter what kind of switch you’re using, heat coming off the switch
is a sign that it has electricity running through it. This might seem
obvious, but in most cases a traditional switch should never have enough
electricity coursing through it to become warm. If your on/off switch is warm or hot to the touch, it’s a good sign of
too much power running through it. This can be caused by bad
installation, hooking up a switch to a circuit with a higher amp load
than it can handle. It can also be caused by a bad wire bottlenecking
the electrical current, which will cause it to give off heat. This is a
very real fire hazard! If your on/off switch is giving off a lot of
heat, turn it off and call an electrician!